Facebook CEO Mark Zuckerberg and his wife, Priscilla Chan, are donating $25 million to the CDC Foundation to help address the Ebola epidemic.

The money will be used by the U.S. Centers for Disease Control and Prevention’s Ebola response effort in Guinea, Liberia and Sierra Leone and elsewhere in the world where Ebola is a threat, the foundation said Tuesday.

The grant follows a $9 million donation made by Microsoft co-founder Paul Allen last month. Zuckerberg and Chan are making the grant from their fund at the nonprofit Silicon Valley Community Foundation.

NEW YORK — The little blue bird is flying high. Stronger-than-expected financial results pushed Twitter’s stock sharply higher on Tuesday after the short messaging service said its revenue more than doubled in the second quarter.

Twitter also grew its user base more than expected, alleviating concerns, at least for now, that it doesn’t hold appeal for a broad swath of people. Its larger rival, Facebook, also posted strong results last week and its stock is trading near a record high.

NEW YORK — Facebook users in the U.S. will soon be able to see which of their friends are nearby using a new feature the company launched on Thursday.

The “Nearby Friends” feature must be turned on by the user, so people shouldn’t expect to broadcast their location unknowingly. It will use your smartphone’s GPS system to tell your Facebook friends you are nearby — provided they have the feature turned on as well. Rather than share your exact location, it will show only that you are nearby, say, within half a mile.

NEW YORK — In a move that echoes Twitter, Facebook is adding a feature to its service that lets users know the topics of discussion that are trending among the site’s 1.2 billion users, whether it’s the death of a world leader or the Oscars.

Users in the U.S., U.K., India, Canada and Australia will begin seeing a list of trending topics on the right side of their Facebook pages in coming weeks. It will be available in more countries later on.

11/12/13 - 1:03am

NEW YORK — Amazon is rolling out Sunday package delivery as part of a new deal with the U.S. Postal Service.

Delivery started on Sunday to customers in the New York and Los Angeles metropolitan areas, but Amazon and the Postal Service plan to extend service to “a large portion of the U.S. population” next year, the company said. This includes the cities of Dallas, Houston, New Orleans, and Phoenix.

SAN FRANCISCO — Twitter has built a digital town square that’s teeming with activity but riddled with financial potholes. Seven years after co-founder Jack Dorsey sent the first tweet through the online messaging service, more than 500 million posts are shared each day by everyone from the Dalai Lama to Justin Bieber.

But all the chirping hasn’t translated to profits — nor is it expected to any time soon.